Discussions Foundations and BasementsRadon in Homes - Mitigation Is there a liquid applied radon barrier paint for basement floors that works? Save Like Comment(3) Print Share Facebook Twitter Email T Is sealing basement concrete floor against radon a good idea? Tim Hanrahan Sept. 18, 2020Last updated: Sept. 22, 2020 Now that I have removed everything from my basement, I have this nice pristine unfinished concrete floor and walls. I have heard of a product called radon block, I believe this is a sealer of some kind. Just wondering if sealing my floor is worth it and what the general thoughts are regarding sealing bare concrete?